The Paris prosecutor's office says French anti-terrorism forces have arrested four people, including a 16-year-old girl, and uncovered a makeshift laboratory with the explosive TATP.

The arrests Friday were in the Montpellier area of southern France. The prosecutor's office said around 70 grams of TATP were seized. The explosive, which can be made from readily available ingredients, was used in the November 2015 attack in Paris and the March 2016 attack in Brussels.

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A Paris police official, speaking on condition of anonymity to discuss the unfolding investigation, said one of the suspects was believed to be planning a suicide attack.

According to the BBC, at least 230 people have been killed in Jihadist attacks in France since 2015. Just last month, a machete-wielding man attack a soldier at the famed Louvre museum in Paris.

Citing a French news agency, the BBC report said the female suspect was spotted on social network sites saying she wanted to leave for the Syria-Iraq conflict zone or attack France. In a video, she pledged support to the Islamic State.